var preloadedImages = new Array();

function preloadImages(locationFolder) {
    if(document.images) {
            var i, args = preloadImages.arguments; 
            for(i=1; i<args.length; i++) {
                preloadedImages[args[i]]   = new Image(); 
                preloadedImages[args[i]].src   = locationFolder + args[i];
            }
    }
}
function rollOn(imageName) {
     if(document.images)
     document.images[imageName].src = preloadedImages[imageName + "_over.gif"].src;
}
function rollOff(imageName) {
    if(document.images)
     document.images[imageName].src = preloadedImages[imageName + "_normal.gif"].src;
}

function showPhoto(id) {
	window.open("ShowPhoto.aspx?photo_id="+id,null,"width=730,height=568,status=no,toolbar=no,menubar=no,location=no,resizable=no,scrollbars,titlebar=no");
}

function roll_On(imageName) {
     if(document.images)
     document.images[imageName].src = preloadedImages[imageName + "01_over.gif"].src;
     document.images[imageName].src = preloadedImages[imageName + "02_over.gif"].src;
}
function roll_Off(imageName) {
    if(document.images)
     document.images[imageName].src = preloadedImages[imageName + "01_normal.gif"].src;
     document.images[imageName].src = preloadedImages[imageName + "02_normal.gif"].src;
}